Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 090d25fe authored by Loic Pallardy's avatar Loic Pallardy Committed by Chris Ball
Browse files

mmc: core: Expose access to RPMB partition 



Following JEDEC standard, if the mmc supports RPMB partition,
a new interface is created and exposed via /dev/block.
Users will be able to access RPMB partition using standard
mmc IOCTL commands.

Signed-off-by: default avatarAlex Macro <alex.macro@stericsson.com>
Signed-off-by: default avatarLoic Pallardy <loic.pallardy@stericsson.com>
Reviewed-by: default avatarNamjae Jeon <linkinjeon@gmail.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarJohan Rudholm <johan.rudholm@stericsson.com>
Acked-by: default avatarKrishna Konda <kkonda@codeaurora.org>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent ed9dbb6e

drivers/mmc/core/mmc.c

+11 −0
Original line number Diff line number Diff line
@@ -491,6 +491,17 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd) 


		card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];

		card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];



		/*

		 * RPMB regions are defined in multiples of 128K.

		 */

		card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];

		if (ext_csd[EXT_CSD_RPMB_MULT]) {

			mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,

				EXT_CSD_PART_CONFIG_ACC_RPMB,

				"rpmb", 0, false,

				MMC_BLK_DATA_AREA_RPMB);

		}

	}



	card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];

include/linux/mmc/card.h

+2 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ struct mmc_ext_csd { 
	bool			boot_ro_lockable;

	u8			raw_exception_status;	/* 53 */

	u8			raw_partition_support;	/* 160 */

	u8			raw_rpmb_size_mult;	/* 168 */

	u8			raw_erased_mem_count;	/* 181 */

	u8			raw_ext_csd_structure;	/* 194 */

	u8			raw_card_type;		/* 196 */
@@ -206,6 +207,7 @@ struct mmc_part { 
#define MMC_BLK_DATA_AREA_MAIN	(1<<0)

#define MMC_BLK_DATA_AREA_BOOT	(1<<1)

#define MMC_BLK_DATA_AREA_GP	(1<<2)

#define MMC_BLK_DATA_AREA_RPMB	(1<<3)

};



/*

include/linux/mmc/mmc.h

+2 −0
Original line number Diff line number Diff line
@@ -286,6 +286,7 @@ struct _mmc_csd { 
#define EXT_CSD_BKOPS_START		164	/* W */

#define EXT_CSD_SANITIZE_START		165     /* W */

#define EXT_CSD_WR_REL_PARAM		166	/* RO */

#define EXT_CSD_RPMB_MULT		168	/* RO */

#define EXT_CSD_BOOT_WP			173	/* R/W */

#define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */

#define EXT_CSD_PART_CONFIG		179	/* R/W */
@@ -339,6 +340,7 @@ struct _mmc_csd { 


#define EXT_CSD_PART_CONFIG_ACC_MASK	(0x7)

#define EXT_CSD_PART_CONFIG_ACC_BOOT0	(0x1)

#define EXT_CSD_PART_CONFIG_ACC_RPMB	(0x3)

#define EXT_CSD_PART_CONFIG_ACC_GP0	(0x4)



#define EXT_CSD_PART_SUPPORT_PART_EN	(0x1)